Multiplex communications – Wide area network – Packet switching
Patent
1990-08-31
1993-08-17
Olms, Douglas W.
Multiplex communications
Wide area network
Packet switching
370 67, 370 681, 370 851, 3701101, H04Q 1104
Patent
active
052375633
ABSTRACT:
A four-wire line unit interface circuit used on four-wire line units in a line shelf of a digital loop carrier provides all of the logic necessary to access a subscriber line to a line unit interface bus connected to common equipment within the line shelf. Information received from the common equipment includes signaling data, configuration data and provisioning data which is reconfigured and processed by the line unit interface circuit for controlling the subscriber line. Configuration data from the common equipment is decoded to assign time slots on a line unit interface bus to the various channels serviced by the line shelf and to further provide for a timing offset between the transmit and receive strobes provided to each subscriber line circuit. An asynchronously operating microprocessor is provided on the four-wire line unit, and a microprocessor interface is provided to interface the asynchronously operating microprocessor with the data provided on the line unit interface bus. CODEC and Equalizer devices provided on the four-wire line unit are provisioned and audited through the interface circuit.
REFERENCES:
patent: 4059729 (1977-11-01), Eddy et al.
patent: 4849972 (1989-07-01), Hackett et al.
patent: 4993019 (1991-02-01), Cole et al.
Alcatel Network Systems, Inc.
Hsu Alpus H.
Olms Douglas W.
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